Yesteryears' tradeshow queen, projection keyboards are seeping into the markets. Elecom is one of those propagating it. The Japanese company unveiled TK-PBL042BK, a wireless projection keyboard. All it requires is a flat surface (such as a desk top), and for the host to support Bluetooth or USB interfaces. The keyboard follows a host interface model that's natively supported by iOS and Android.

With PCs, it works over common Bluetooth HID driver model. Apart from Bluetooth, the device can also connect to a host over USB, and work as a USB HID keyboard, while charging its battery. The device projects a keyboard onto a flat surface, and tracks your fingers pressing against the projected buttons. Measuring 38.0 x 29.0 x 75.0 mm, it weighs 77 g without battery. The rechargeable battery supports up to two hours of continuous use. Slated for early-April, the TK-PBL042BK from Elecom is priced at 28,875 JPY (US $352).